EP4338886A1 - Coolant processing apparatus - Google Patents
Coolant processing apparatus Download PDFInfo
- Publication number
- EP4338886A1 EP4338886A1 EP23192165.1A EP23192165A EP4338886A1 EP 4338886 A1 EP4338886 A1 EP 4338886A1 EP 23192165 A EP23192165 A EP 23192165A EP 4338886 A1 EP4338886 A1 EP 4338886A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coolant
- sludge
- reservoir
- processing apparatus
- boundary wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000002826 coolant Substances 0.000 title claims abstract description 247
- 238000012545 processing Methods 0.000 title claims description 81
- 239000010802 sludge Substances 0.000 claims abstract description 201
- 239000006228 supernatant Substances 0.000 claims abstract description 13
- 230000000717 retained effect Effects 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 25
- 239000007924 injection Substances 0.000 claims description 25
- 238000013019 agitation Methods 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 238000005192 partition Methods 0.000 abstract description 25
- 239000002244 precipitate Substances 0.000 abstract description 7
- 230000004048 modification Effects 0.000 description 14
- 238000012986 modification Methods 0.000 description 14
- 238000004140 cleaning Methods 0.000 description 10
- 238000009825 accumulation Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002173 cutting fluid Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000006399 behavior Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
- B23Q11/1084—Arrangements for cooling or lubricating tools or work specially adapted for being fitted to different kinds of machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0018—Separation of suspended solid particles from liquids by sedimentation provided with a pump mounted in or on a settling tank
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
- B01D21/0036—Horizontal partition walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
- B23Q11/1069—Filtration systems specially adapted for cutting liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2221/00—Applications of separation devices
- B01D2221/14—Separation devices for workshops, car or semiconductor industry, e.g. for separating chips and other machining residues
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Definitions
- the present disclosure relates to a coolant processing apparatus configured to remove sludge from a coolant that is discharged from a machine tool and that includes the sludge.
- a coolant used in various machine tools such as a machining center include chips and sludge discharged in the course of processing. After separation or removal of these chips and sludge from the coolant by a filter or the like provided in a coolant processing apparatus, the coolant is circulated into the machine tool. In the case where the chips and sludge remain in the coolant, the sludge may be accumulated in a tank for the coolant. This increases the load of cleaning and may cause the chips and the sludge to adhere to a processed surface. This may lower the processing quality or may damage the machine tool.
- Various techniques have accordingly be proposed to remove the chips and the sludge from the coolant.
- Patent Literature 1 discloses a technique that temporarily draws up a cutting fluid from a flow path of the cutting fluid to remove sludge and returns the cutting fluid after removal of the sludge to the flow path, with a view to preventing accumulation of the sludge.
- Patent Literature 2 discloses a technique that forms a curved wall in a tank for a coolant to allow the flow of the coolant to smoothly change the direction at a corner of the tank, with a view to preventing accumulation of the sludge at the corner or the like of the tank.
- Patent Literature 3 discloses a technique that injects and stirs a coolant in a tank for the coolant, with a view to preventing accumulation of the sludge.
- the sludge is, however, very fine and small and may not be sufficiently removed by the filter.
- the prior art configurations may suppress accumulation of sludge, but there is still a room for improvement in terms of effective removal of sludge.
- an object of the present disclosure is to enable sludge to be effectively removed from a coolant.
- a coolant processing apparatus configured to remove sludge from a coolant that is discharged from a machine tool and that includes the sludge.
- the coolant processing apparatus comprises a first reservoir provided inside of a tank for the coolant and configured to retain the coolant therein such as to cause the sludge to stay; a second reservoir provided adjacent to the first reservoir and configured to retain therein the coolant flowing out from the first reservoir; and a boundary wall provided to configure a boundary between the first reservoir and the second reservoir and to have a height that allows a supernatant of the coolant retained in the first reservoir to flow out to the second reservoir.
- the configuration of this aspect causes the sludge to stay in the first reservoir and not to flow out by means of the boundary wall and allows only the supernatant of the coolant to be flowed out to the second reservoir.
- This configuration accordingly allows for removal of the sludge.
- the state that the sludge "stays" herein denotes a state that the sludge precipitates or is accumulated in the coolant and a state prior to such precipitation, i.e., a state that the sludge floats and drifts in part of the coolant other than the supernatant.
- the configuration of this aspect is implemented by simply placing the boundary wall inside of the tank for the coolant to provide the first reservoir and the second reservoir. Another advantage of this aspect is thus to take advantage of the general structure of a prior art coolant processing apparatus without changing the size of the entire apparatus.
- the location and the height of the boundary wall may be determined, for example, by analysis based on, for example, simulation of the flow velocity of the coolant in the tank for the coolant or by experiment.
- a filter may be provided on an upstream side of the first reservoir to remove chips and relatively large sludge.
- the blocking plate herein denotes a plate that prevents the flow on an upper surface thereon and that is open only in the vicinity of a bottom face.
- a blocking plate is used to remove, for example, chips floating and drifting in the coolant and sludge that is more likely to be accumulated.
- the coolant flows in a narrow flow path in the vicinity of the bottom face and tends to increase the flow velocity. This may prevent very fine sludge from staying in the first reservoir and may thus interfere with the effectiveness of removing the fine sludge.
- the boundary wall may have a height that decreases a flow velocity of the coolant in the first reservoir at least partly to a level that causes the sludge to be accumulated.
- the configuration of this aspect further suppresses the sludge from being contained in the supernatant.
- this configuration does not expand the location where the sludge precipitates and is accumulated, to the inside of the entire tank for the coolant but limits the location to the inside of the first reservoir. This configuration thus advantageously reduces the load of cleaning inside of the tank.
- the height of this aspect may be determined, for example, by analysis or by experiment.
- the first reservoir may have a shape or a structure that causes the sludge to be accumulated in a specific area.
- the configuration of this aspect causes the sludge to be accumulated in the specific area. This configuration advantageously further facilitates, for example, collection of the sludge and cleaning.
- the specific area herein may not be necessarily a strict area having distinct boundaries. It is only necessary that the first reservoir has a specific area where the sludge is more likely to be accumulated. This specific area may be formed by adjusting, for example, the height of the boundary wall, the internal shape or configuration of the first reservoir, the shape or configuration of a bottom face of the first reservoir, and a flow path of the coolant flowing into the first reservoir by experiment or by analysis.
- the boundary wall may be provided at a location on a downstream side of a bend of the flow of the discharged coolant that is bent once or a plurality of times in a horizontal direction in the first reservoir.
- Bending the flow of the coolant in the first reservoir lowers the flow velocity of the coolant and enables the sludge to effectively stay in the first reservoir.
- Providing the boundary wall at the location on the downstream side of the bend of the flow reduces the flow velocity in the vicinity of the boundary wall and thereby enables the supernatant of the coolant to flow out from the first reservoir with keeping the sludge stay in the first reservoir.
- the angle and the number of times of bending the flow may be determined arbitrarily.
- the number of times of bending the flow may be determined by taking into account such advantages.
- the coolant processing apparatus of the above aspect may further comprise a sludge collection pump placed on an upstream side of the boundary wall in the first reservoir to collect the sludge precipitating in the first reservoir.
- the configuration of this aspect enables the sludge staying in the first reservoir to be collected. Even when the entire sludge staying in the first reservoir is not collectable by the sludge collection pump, this configuration of providing the sludge collection pump advantageously reduces the amount of the sludge staying in the first reservoir and reduces the possibility that the sludge rides over the boundary wall and flows out to the second reservoir.
- the type, the structure and the location of the sludge collection pump may be determined arbitrarily.
- the number of the sludge collection pump provided in the coolant processing apparatus is not limited to one sludge collection pump but may be a plurality of sludge collection pumps.
- the sludge collection pump is not an essential component.
- the sludge that precipitates and that is accumulated in the first reservoir may be collected by cleaning the first reservoir.
- the first reservoir may have a shape or a structure that causes the sludge to be accumulated in a specific area, and the sludge collection pump may be provided in the specific area in the first reservoir.
- the configuration of this aspect enables the sludge to be collected efficiently.
- the state that the sludge floats and drifts in the coolant may be preferable over the state that the sludge is fully accumulated.
- the sludge collection pump may be provided at a location where the coolant flows at a flow velocity that is equal to or higher than a certain level of flow velocity that does not cause precipitation of the sludge, in the first reservoir.
- the sludge floats and drifts in the coolant at a location where the flow velocity of the coolant is equal to or higher than a predetermined value. This configuration thus enables the sludge to be collected effectively.
- the sludge collection pump may be placed at a location that has a shorter distance to the boundary wall than a distance to the bend of the flow, i.e., at a location nearer to the bend of the flow than the boundary wall.
- the boundary wall is provided on the downstream side of the location where the flow of the coolant is bent to decrease the flow velocity.
- the location nearer to the bend of the flow than the boundary wall has the higher flow velocity of the coolant and is thus suitable to place the sludge collection pump.
- the sludge collection pump is placed at a location nearer to the bend of the flow than the boundary wall, i.e., on a bend-of-the-flow side of a midpoint between the boundary wall and the bend of the flow. This configuration causes the sludge collection pump to be placed at a location having a relatively high flow velocity of the coolant in the first reservoir and enables the sludge to be effectively collected.
- the sludge collection pump may have an inlet port that is configured to suck the coolant upward.
- the coolant processing apparatus may further comprise an agitation plate provided at a location opposed to the inlet port on a bottom face of the first reservoir and configured to suppress stagnation of the flow of the coolant to the sludge collection pump.
- the agitation plate may be in any of various shapes.
- the agitation plate may be an axisymmetric solid having a sectional area monotonically decreasing from a bottom face toward a top.
- Such solid examples include a cone and a paraboloidal surface.
- the diameter, the height and the like of such solid may be determined arbitrarily.
- the coolant processing apparatus provided with the sludge collection pump may further comprise a separator configured to separate the sludge from the coolant collected by the sludge collection pump.
- the configuration of this aspect enables the coolant after separation of the sludge to be recycled and reused.
- Any of various devices may be used for the separator.
- a cyclone device may be used for the separator.
- the coolant processing apparatus provided with the separator may further comprise an injection port configured to inject the coolant after separation of the sludge by the separator, to a portion where the flow of the coolant has a lower flow velocity than a flow velocity of the coolant in a peripheral portion thereof.
- the configuration of this aspect forms the flow of the coolant in the tank by injection of the coolant and thereby assists circulation of the coolant.
- the injection port may be provided in the second reservoir.
- the coolant after removal of the sludge is retained in the second reservoir.
- a tiny amount of fine sludge that does not cause a substantial trouble in processing or machine working is left in the coolant.
- Such sludge may precipitate and be accumulated in a portion having a low flow velocity of the coolant in the second reservoir.
- This configuration enables the coolant to be injected to this portion and thereby prevents accumulation of the sludge.
- the coolant after separation of the sludge is reused for this purpose. This cuts the waste.
- the coolant processing apparatus of the above aspect may further comprise a coolant feeding-in pump provided in the second reservoir and configured to collect the coolant.
- the configuration of this aspect enables the coolant after removal of the sludge to be reused for processing or machine working.
- the position and the number of the coolant feeding-in pumps may be set arbitrarily.
- any of the aspects of the present disclosure may not necessarily include all the features described above. Part of these features may be appropriately omitted or may be appropriately adopted in combination.
- Fig. 1 is explanatory views illustrating the general configuration of a prior art coolant processing apparatus 1.
- Fig. 1A illustrates the outline of a planar configuration
- Fig. 1B illustrates the outline of an X1-X1 sectional configuration.
- a coolant used in a machine tool is flowed along with chips and sludge into the coolant processing apparatus 1 as shown by an arrow A1 in Fig. 1A .
- a filter and a chip conveyor 2 configured to discharge the chips are provided inside of the coolant processing apparatus 1.
- the coolant after removal of the chips and relatively large sludge by means of the filter is flowed out to a tank 3 as shown by an arrow A2.
- the area DL is an area where the coolant prior to the removal of the chips and the like by means of the filter is kept and retained and is called a dirty layer.
- the area CL is an area where the coolant after the removal of the chips and the like by means of the filter is kept and retained and is called a clean layer.
- a plurality of pumps 4 are provided in the clean layer and serve to circulate and return the coolant to the machine tool.
- Part of the sludge included in the coolant is, however, fine sludge that is not removable by the filter.
- the coolant including such fine sludge is retained in the clean layer CL. Circulation of the coolant including the fine sludge to the machine tool is likely to cause troubles or problems, such as reduction of the processing quality and acceleration of the wear of the tool.
- the accumulation of the sludge in the clean layer CL requires cleaning of the entire area corresponding to the clean layer CL. Such cleaning imposes an extremely heavy load.
- a coolant processing apparatus according to an embodiment of the present disclosure described below aims to solve these problems.
- Fig. 2 is an explanatory view illustrating the general configuration of a coolant processing apparatus 10 according to one embodiment.
- the general configuration of the coolant processing apparatus 10 according to the embodiment is similar to that of the prior art coolant processing apparatus 1 (shown in Fig. 1 ).
- One advantage of the configuration of this embodiment is to provide the coolant processing apparatus 10 of the embodiment by taking advantage of the configuration of the prior art coolant processing apparatus 1 with some modification of the internal structure thereof.
- a coolant used in a machine tool is flowed along with chips and sludge into the coolant processing apparatus 10 as shown by an arrow A1. While the chips are discharged by a chip conveyor 12, the coolant after removal of the chips and relatively large sludge by means of a filter is flowed out to a tank 20 as shown by an arrow A2.
- a dirty layer DL Inside of the coolant processing apparatus 10 is divided into a dirty layer DL and a clean layer CL, like the prior art configuration (shown in Fig. 1 ).
- a hatched part indicates the dirty layer DL, and a remaining part indicates the clean layer CL.
- the partition plate 25 has an inlet port 26 that is formed to allow the coolant to flow into from the dirty layer DL.
- the clean layer CL is divided into a plurality of areas by these partition plates 21, 22, 24 and 25 and the boundary wall 23.
- An area 20a is a portion defined by the partition plates 21 and 25 to form a flow path of the coolant flowing from the dirty layer DL to the clean layer CL.
- An area 20b is a portion defined by the partition walls 21, 22, and 24 and the boundary wall 23 to keep and retain the coolant therein.
- the areas 20a and 20b configure the first reservoir. As described above, sludge stays in this first reservoir.
- the coolant flowing out from the inlet port 26 as shown by the arrow A2 flows as shown by an arrow F.
- the coolant is retained in the first reservoir defined by the partition plates 21, 22, 24 and 25 and the boundary wall 23. Retaining the coolant causes fine sludge included in the coolant to stay in the first reservoir. More specifically, part of the sludge precipitates in the first reservoir, whereas the remaining sludge floats and drifts in the coolant and gradually sinks down. A supernatant portion is accordingly the coolant that contains almost no sludge.
- the boundary wall 23 is lower than the partition plates 21, 22 and 24 and thereby enables the clear supernatant of the coolant that contains almost no sludge to flow out.
- This coolant changes the flow direction thereof at bends or flexures F2 and F3 and flows in a flow path formed outside of the partition plates 22 and 21 as shown by the arrow F.
- a portion after the coolant is flowed out from the boundary wall 23 is called the second reservoir.
- the sludge stays in the first reservoir.
- a cleaning procedure accordingly requires detachment of a cover corresponding to only the first reservoir and does not require detachment of a cover corresponding to the entire clean layer CL for cleaning. This configuration thus advantageously reduces the cleaning load.
- the boundary wall 23 is provided ahead of the bend or flexure F1 where the flow of the coolant from the area 20a to the area 20b is bent. In other words, the boundary wall 23 is provided at a location where the flow velocity of the coolant flowing from the area 20a is lowered. This configuration prevents the sludge staying in the coolant retained in the first reservoir from rolling up and riding over the boundary wall 23 to flow out.
- the height of the boundary wall 23 changes the flow and the flow velocity of the coolant in the first reservoir and changes the behavior of the sludge in the first reservoir. Accordingly, the height of the boundary wall 23 may be determined by analysis or by experiment by taking into account the flow velocity of the coolant and the size of the sludge, with a view to allowing only the supernatant to flow out. The height of the boundary wall 23 may be adjusted to cause the sludge to be accumulated in a predetermined area S in the first reservoir.
- the shapes, the configurations and the like of the partition plates 21, 22, 24 and 25, in addition to the height of the boundary wall 23, may be adjusted in order to control the behaviors of the sludge as intended, for example, in order to cause the sludge to stay in the first reservoir and to be accumulated in the predetermined area S.
- a sludge collection pump 30 is provided inside of the first reservoir to collect the staying sludge.
- the position of the sludge collection pump 30 may be determined arbitrarily but is provided in the area S where the sludge is accumulated, in the first reservoir according to the embodiment.
- the area S is present at a location in the vicinity of the boundary wall 23, so that the sludge collection pump 30 is provided at this location.
- the position of the sludge collection pump 30 is accordingly farther from the boundary wall 23.
- the area S where the sludge is accumulated is present at a location farther from the boundary wall 23.
- the sludge collection pump 30 may be provided at a location where the flow velocity of the coolant is kept at a certain level that does not cause the sludge to fully precipitate. This location may be determined, for example, by experiment or by analysis.
- the sludge collection pump 30 may be provided at a location near to the bend or flexure F1 of the flow of the coolant (shown in Fig. 2 ).
- An area 20c is an area defined by the boundary wall 23 and an outer wall of the tank 20.
- An area 20d is an area defined by the partition plate 22 and the outer wall of the tank 20.
- An area 20e is an area defined by the partition plate 21 and the outer wall of the tank 20.
- Injection ports 41 and 42 of the coolant are respectively provided in the areas 20c and 20e of the second reservoir.
- the purified coolant after collection of the sludge by the sludge collection pump 30 and removal of the sludge by a cyclone device described later is circulated to these areas 20c and 20e.
- the positions of the injection ports 41 and 42 may be set arbitrarily, but the injection ports 41 and 42 are provided at locations where the flow velocity of the coolant is more likely to be lowered inside of the second reservoir according to this embodiment. This configuration suppresses stagnation of the coolant in the second reservoir.
- the coolant after removal of the sludge is retained in the second reservoir. There is, however, a possibility that a tiny amount of fine sludge that does not cause a substantial trouble in processing or machine working is left in the coolant.
- Providing the injection ports 41 and 42 at the locations where the flow velocity of the coolant is more likely to be lowered according to the embodiment suppresses the flow velocity of the coolant from being lowered and prevents accumulation of the sludge.
- a plurality of coolant feeding-in pumps 50 are provided in the area 20e of the second reservoir.
- the coolant after sufficient removal of the sludge in the first reservoir is collected by the coolant feeding-in pumps 50 to be recycled to and reused in the machine tool.
- the number and the locations of the coolant feeding-in pumps 50 may be determined arbitrarily.
- the configuration of the embodiment that provides the first reservoir and the second reservoir in the tank of the coolant to allow for removal of the fine sludge prevents troubles caused by the inflow of the coolant including the sludge into the machine tool.
- Fig. 3 is an explanatory view schematically illustrating the general configuration of the sludge collection pump 30.
- the right side of the drawing shows the state in the vicinity of an inlet port 31 of the sludge collection pump 30 placed in the area 20b.
- the inlet port 31 of the sludge collection pump 30 is formed in a cylindrical shape and is attached to suck the coolant vertically upward relative to a bottom face of the tank 20.
- An agitation plate 32 is provided at a position opposed to the inlet port 31 on the bottom face of the tank 20.
- the agitation plate 32 may be formed in a cone-like shape as illustrated.
- the shape of the agitation plate 32 is, however, not limited to the illustrated example but may be any of various shapes having a gradually decreasing sectional area in a circular cross section.
- a projection 33 in a columnar shape may be added to the top of the agitation plate 32 as illustrated.
- the flow of the coolant is likely to stagnate at a location corresponding to a central axis of the inlet port 31.
- Providing the agitation plate 32 as illustrated prevents stagnation of the flow of the coolant in the vicinity of the center of the inlet port 31 or prevents the flow velocity of the coolant from being lowered in the vicinity of the center of the inlet port 31 and thereby enables the sludge to be effectively collected.
- the boundary wall 23 has a height H2 that is lower than a height H1 of the partition wall 22.
- This configuration allows only the supernatant of the coolant to flow out of the boundary wall 23 as shown by arrows b.
- Providing the boundary wall 23 in such settings lowers the flow velocity of the coolant and causes the sludge included in the coolant to sink down as shown by arrows a and to be accumulated in a predetermined area.
- the coolant with the accumulated sludge is collected by the sludge collection pump 30.
- the height H2 looks like almost half the height H1. This is, however, only illustrative and does not intend to limit the height of the boundary wall 23 to this height range.
- the coolant collected by the sludge collection pump 30 is flowed into a cyclone device 40 that is configured to separate the sludge from the coolant by taking advantage of the centrifugal force.
- the separated sludge is discharged from the cyclone device 40 by opening a drain valve (not shown).
- the coolant after removal of the sludge is injected through the injection ports 41 and 42 (shown in Fig. 2 ) into the tank 20.
- the cyclone device 40 is used for separation of the sludge according to the embodiment, but another mechanism may be employed for separation of the sludge. In the case where there is no need to recycle and reuse the coolant after separation of the sludge, the cyclone device 40 may be omitted, and the coolant with the accumulated sludge may be discarded.
- Fig. 4 is explanatory views illustrating the general configuration of another prior art coolant processing apparatus 1A.
- the coolant processing apparatus 1A of Fig. 4 has a different configuration from that of the coolant processing apparatus 1 of Fig. 1 .
- Fig. 4A illustrates the outline of a planar configuration
- Fig. 4B illustrates the outline of an X2-X2 sectional configuration.
- a chip conveyor 2A is placed at the approximate center in planar view as shown in Fig. 4A .
- a coolant is flowed into the coolant processing apparatus 1A as shown by an arrow A1 and flows out from both sides of the chip conveyor 2A into a tank 3 as shown by arrows A2. Chips and relatively large sludge are removed by filters from the respective flows of the coolant, like the coolant processing apparatus 1 shown in Fig. 1 .
- an area prior to the outflow of the coolant as shown in the arrows A2 is a dirty layer DL, and an area after the outflow is a clean layer CL.
- a plurality of pumps 4A for collection of sludge are provided in the clean layer CL.
- Fig. 5 is an explanatory view schematically illustrating the planar configuration of a coolant processing apparatus 10A according to a modification.
- the coolant processing apparatus 10A of the modification is implemented by modifying the internal structure of the coolant processing apparatus 1A shown in Fig. 4 .
- a partition plate 21A is placed such as to form only one inlet port 26A which the coolant is flowed through from a dirty layer DL into a clean layer CL.
- the coolant flows through the one inlet port 26A into the clean layer CL as shown by an arrow A2.
- Discharge of chips and relatively large sludge by a chip conveyor 12A and removal of the chips and the relatively large sludge by a filter are similar to those described above in the embodiment.
- a first reservoir is formed by partition plates 22A and 24A and a boundary wall 23A.
- the coolant in the first reservoir flows as shown by an arrow FA to be bent at a bend or flexure FA1 and subsequently flow toward the boundary wall 23A with decreasing the flow velocity.
- adjustment of the height of the boundary wall 23A causes the sludge to stay in the first reservoir and enables only the supernatant to flow out to the downstream of the boundary wall 23A, i.e., to a second reservoir.
- Adjusting the height of the boundary wall 23A and the shape, the configuration and the like of the partition wall 24A enables the sludge to be accumulated in a predetermined area in the first reservoir.
- a sludge collection pump 30A is provided in the first reservoir. As in the embodiment described above, the sludge collection pump 30A is placed at a location where sludge is accumulated in the first reservoir. The coolant collected by the sludge collection pump 30A is subjected to separation of the sludge by means of a cyclone device and is then returned into a tank 20A through injection ports 41A and 42A.
- the injection ports 41 and 42 are provided in the second reservoir (as shown in Fig. 2 ).
- the injection port 41A may be provided in the first reservoir, and the injection port 42A may be provided in the second reservoir.
- This configuration enables the injection ports 41A to be used to control the flow of the coolant in the first reservoir.
- the arrangement of the injection ports is, however, not limited to the illustrated example. Both the injection ports may be provided in the first reservoir or may be provided in the second reservoir.
- Pumps 50A for collection of the coolant are placed in the second reservoir.
- the coolant collected by these pumps 50A is circulated to the machine tool.
- Fig. 6 is explanatory views illustrating the general configuration of another prior art coolant processing apparatus 1B.
- Fig. 6A illustrates the outline of a planar configuration
- Fig. 6B illustrates the outline of an X3-X3 sectional configuration.
- a chip conveyor 2B is placed at the approximate center in planar view and on an upper side of a tank 3B as shown in Fig. 6A .
- a coolant is flowed into the coolant processing apparatus 1B as shown by an arrow A1, flows below the chip conveyor 2B, and flows out from both sides of the chip conveyor 2B into the tank 3B as shown by arrows A2. Chips and relatively large sludge are removed by filters from the respective flows of the coolant, like the coolant processing apparatus 1 shown in Fig. 1 .
- an area prior to the outflow of the coolant as shown in the arrows A2 is a dirty layer DL, and an area after the outflow is a clean layer CL.
- a plurality of pumps 4B for collection of sludge are provided in the clean layer CL.
- Fig. 7 is an explanatory view schematically illustrating the planar configuration of a coolant processing apparatus 10B according to a modification.
- the coolant processing apparatus 10B of the modification is implemented by modifying the internal structure of the coolant processing apparatus 1B shown in Fig. 6 .
- a partition plate 21B is placed such as to form only one inlet port 26B which the coolant is flowed through from a dirty layer DL into a clean layer CL. As a result, the coolant flows through the one inlet port 26B into the clean layer CL as shown by an arrow A2. Discharge of chips and relatively large sludge by a chip conveyor 12B and removal of the chips and the relatively large sludge by a filter are similar to those described above in the embodiment.
- a first reservoir is formed by partition plates 22B and 24B and a boundary wall 23B.
- the coolant in the first reservoir flows as shown by an arrow FB to be bent at a bend or flexure FB1 and subsequently flow toward the boundary wall 23B with decreasing the flow velocity.
- adjustment of the height of the boundary wall 23B causes the sludge to stay in the first reservoir and enables only the supernatant to flow out to the downstream of the boundary wall 23B, i.e., to a second reservoir.
- Adjusting the height of the boundary wall 23B and the shape, the configuration and the like of the partition wall 24B enables the sludge to be accumulated in a predetermined area in the first reservoir.
- a sludge collection pump 30B is provided in the first reservoir. As in the embodiment described above, the sludge collection pump 30B is placed at a location where sludge is accumulated in the first reservoir. The coolant collected by the sludge collection pump 30B is subjected to separation of the sludge by means of a cyclone device and is then returned into a tank 20B through injection ports 41B and 42B.
- the injection ports 41 and 42 are provided in the second reservoir (as shown in Fig. 2 ).
- the injection port 41B may be provided in the first reservoir, and the injection port 42B may be provided in the second reservoir.
- This configuration enables the injection ports 41B to be used to control the flow of the coolant in the first reservoir.
- the arrangement of the injection ports is, however, not limited to the illustrated example. Both the injection ports may be provided in the first reservoir or may be provided in the second reservoir.
- Pumps 50B for collection of the coolant are placed in the second reservoir.
- the coolant collected by these pumps 50B is circulated to the machine tool.
- the coolant processing apparatus causes the fine sludge included in the clean layer to stay in the first reservoir and thereby effectively removes the sludge. Another advantage is to achieve such effects by the simple configuration of dividing the inside of the tank into the first reservoir and the second reservoir, with taking advantage of the prior art tank structure for the coolant.
- the position of the boundary wall 23, 23A or 23B is not limited to the location described in the embodiment or in the modification.
- the boundary wall 23, 23A or 23B is configured to have the height that is uniformly lower than the height of the partition plate 22 as shown in Fig. 3 . This configuration may, however, be determined arbitrarily.
- the boundary wall may have a configuration including a lower center portion and higher end portions or may have a configuration of changing the height in an arc shape.
- the boundary wall may not be necessarily a flat plate but may be formed in another shape or configuration, for example, to have a curved surface including a center portion protruded toward the first reservoir side or toward the second reservoir side or to have a bent surface.
- boundary wall 23 may not be placed perpendicular to the bottom face but may be placed obliquely, for example, to be inclined to the first reservoir side or to be inclined to the second reservoir side.
- the first reservoir has such a capacity that allows a coolant to be retained with sufficiently decreasing the flow velocity of the coolant by taking into account the inflow of the coolant per time into the first reservoir.
- the present disclosure is applicable to remove sludge from a coolant that is discharged from a machine tool and that includes the sludge.
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Abstract
One object is to remove sludge from a coolant that is discharged from a machine tool and that includes the sludge. In a tank for the discharged coolant, a clean layer after removal of chips and relatively large sludge by means of a filter is further divided by partition plates 21 and 22 and a boundary wall 23 into a first reservoir on an upstream side of the boundary wall 23 and a second reservoir on a downstream side of the boundary wall 23. The coolant including fine sludge that is not removed by the firster is retained in the first reservoir, so that the sludge precipitates or stays in the coolant. The boundary wall 23 is configured to have a height that is lower than the heights of the partition plates 21 and 22 and thereby allows only a supernatant of the coolant that contains almost no sludge to flow out from the first reservoir to the second reservoir. This configuration enables the fine sludge to be effectively removed from the coolant.
Description
- The present disclosure relates to a coolant processing apparatus configured to remove sludge from a coolant that is discharged from a machine tool and that includes the sludge.
- A coolant used in various machine tools such as a machining center include chips and sludge discharged in the course of processing. After separation or removal of these chips and sludge from the coolant by a filter or the like provided in a coolant processing apparatus, the coolant is circulated into the machine tool. In the case where the chips and sludge remain in the coolant, the sludge may be accumulated in a tank for the coolant. This increases the load of cleaning and may cause the chips and the sludge to adhere to a processed surface. This may lower the processing quality or may damage the machine tool. Various techniques have accordingly be proposed to remove the chips and the sludge from the coolant.
- For example,
Patent Literature 1 discloses a technique that temporarily draws up a cutting fluid from a flow path of the cutting fluid to remove sludge and returns the cutting fluid after removal of the sludge to the flow path, with a view to preventing accumulation of the sludge.Patent Literature 2 discloses a technique that forms a curved wall in a tank for a coolant to allow the flow of the coolant to smoothly change the direction at a corner of the tank, with a view to preventing accumulation of the sludge at the corner or the like of the tank.Patent Literature 3 discloses a technique that injects and stirs a coolant in a tank for the coolant, with a view to preventing accumulation of the sludge. -
- Patent Literature 1:
JP 2022-7259A - Patent Literature 2:
JP 6133528B - Patent Literature 3:
JP 6196409B - The sludge is, however, very fine and small and may not be sufficiently removed by the filter. The prior art configurations may suppress accumulation of sludge, but there is still a room for improvement in terms of effective removal of sludge.
- By taking into account such a problem described above, an object of the present disclosure is to enable sludge to be effectively removed from a coolant.
- According to one aspect of the present disclosure, there is provided a coolant processing apparatus configured to remove sludge from a coolant that is discharged from a machine tool and that includes the sludge. The coolant processing apparatus comprises a first reservoir provided inside of a tank for the coolant and configured to retain the coolant therein such as to cause the sludge to stay; a second reservoir provided adjacent to the first reservoir and configured to retain therein the coolant flowing out from the first reservoir; and a boundary wall provided to configure a boundary between the first reservoir and the second reservoir and to have a height that allows a supernatant of the coolant retained in the first reservoir to flow out to the second reservoir.
- The configuration of this aspect causes the sludge to stay in the first reservoir and not to flow out by means of the boundary wall and allows only the supernatant of the coolant to be flowed out to the second reservoir. This configuration accordingly allows for removal of the sludge. The state that the sludge "stays" herein denotes a state that the sludge precipitates or is accumulated in the coolant and a state prior to such precipitation, i.e., a state that the sludge floats and drifts in part of the coolant other than the supernatant.
- It is very difficult to effectively remove fine sludge that has the size of less than approximately 400 micrometers, by means of a filter. The configuration of this aspect, however, enables such fine sludge to be effectively removed without using a filter. One of the problems in the coolant-relating field is accumulation of sludge in a tank for the coolant. The configuration of this aspect, on the contrary, takes advantage of this nature of the sludge that sinks down in the coolant, to remove the sludge.
- The configuration of this aspect is implemented by simply placing the boundary wall inside of the tank for the coolant to provide the first reservoir and the second reservoir. Another advantage of this aspect is thus to take advantage of the general structure of a prior art coolant processing apparatus without changing the size of the entire apparatus.
- According to the above aspect of the present disclosure, the location and the height of the boundary wall may be determined, for example, by analysis based on, for example, simulation of the flow velocity of the coolant in the tank for the coolant or by experiment.
- A filter may be provided on an upstream side of the first reservoir to remove chips and relatively large sludge.
- It is preferable not to provide a blocking plate in the first reservoir at a location that is likely to affect the flow of the coolant on the boundary wall. The blocking plate herein denotes a plate that prevents the flow on an upper surface thereon and that is open only in the vicinity of a bottom face. Such a blocking plate is used to remove, for example, chips floating and drifting in the coolant and sludge that is more likely to be accumulated. At a location where the blocking plate is placed, however, the coolant flows in a narrow flow path in the vicinity of the bottom face and tends to increase the flow velocity. This may prevent very fine sludge from staying in the first reservoir and may thus interfere with the effectiveness of removing the fine sludge. In order to avoid such a potential trouble, in the configuration of this aspect, it is preferable not to provide a blocking plate or to provide a blocking plate at a location farther from the boundary wall not to affect the flow of the coolant.
- According to one aspect, in the coolant processing apparatus of the above aspect, the boundary wall may have a height that decreases a flow velocity of the coolant in the first reservoir at least partly to a level that causes the sludge to be accumulated.
- The configuration of this aspect further suppresses the sludge from being contained in the supernatant.
- Additionally, this configuration does not expand the location where the sludge precipitates and is accumulated, to the inside of the entire tank for the coolant but limits the location to the inside of the first reservoir. This configuration thus advantageously reduces the load of cleaning inside of the tank.
- The height of this aspect may be determined, for example, by analysis or by experiment.
- According to one aspect, in the coolant processing apparatus having the configuration that causes the sludge to be accumulated, the first reservoir may have a shape or a structure that causes the sludge to be accumulated in a specific area.
- The configuration of this aspect causes the sludge to be accumulated in the specific area. This configuration advantageously further facilitates, for example, collection of the sludge and cleaning.
- The specific area herein may not be necessarily a strict area having distinct boundaries. It is only necessary that the first reservoir has a specific area where the sludge is more likely to be accumulated. This specific area may be formed by adjusting, for example, the height of the boundary wall, the internal shape or configuration of the first reservoir, the shape or configuration of a bottom face of the first reservoir, and a flow path of the coolant flowing into the first reservoir by experiment or by analysis.
- According to one aspect, in the coolant processing apparatus of the above aspect, the boundary wall may be provided at a location on a downstream side of a bend of the flow of the discharged coolant that is bent once or a plurality of times in a horizontal direction in the first reservoir.
- Bending the flow of the coolant in the first reservoir lowers the flow velocity of the coolant and enables the sludge to effectively stay in the first reservoir. Providing the boundary wall at the location on the downstream side of the bend of the flow reduces the flow velocity in the vicinity of the boundary wall and thereby enables the supernatant of the coolant to flow out from the first reservoir with keeping the sludge stay in the first reservoir.
- In the coolant processing apparatus of this aspect, the angle and the number of times of bending the flow may be determined arbitrarily. The smaller number of times of bending simplifies the structure, whereas the larger number of times of bending sufficiently lowers the flow velocity. The number of times of bending the flow may be determined by taking into account such advantages.
- According to one aspect, the coolant processing apparatus of the above aspect may further comprise a sludge collection pump placed on an upstream side of the boundary wall in the first reservoir to collect the sludge precipitating in the first reservoir.
- The configuration of this aspect enables the sludge staying in the first reservoir to be collected. Even when the entire sludge staying in the first reservoir is not collectable by the sludge collection pump, this configuration of providing the sludge collection pump advantageously reduces the amount of the sludge staying in the first reservoir and reduces the possibility that the sludge rides over the boundary wall and flows out to the second reservoir.
- In the coolant processing apparatus of this aspect, the type, the structure and the location of the sludge collection pump may be determined arbitrarily.
- The number of the sludge collection pump provided in the coolant processing apparatus is not limited to one sludge collection pump but may be a plurality of sludge collection pumps.
- In the coolant processing apparatus according to the above aspect of the present disclosure, however, the sludge collection pump is not an essential component. The sludge that precipitates and that is accumulated in the first reservoir may be collected by cleaning the first reservoir.
- According to one aspect, in the coolant processing apparatus provided with the sludge collection pump, the first reservoir may have a shape or a structure that causes the sludge to be accumulated in a specific area, and the sludge collection pump may be provided in the specific area in the first reservoir.
- The configuration of this aspect enables the sludge to be collected efficiently.
- In the case of collecting the sludge by means of the sludge collection pump, the state that the sludge floats and drifts in the coolant may be preferable over the state that the sludge is fully accumulated. By taking into account such situation, the sludge collection pump may be provided at a location where the coolant flows at a flow velocity that is equal to or higher than a certain level of flow velocity that does not cause precipitation of the sludge, in the first reservoir. The sludge floats and drifts in the coolant at a location where the flow velocity of the coolant is equal to or higher than a predetermined value. This configuration thus enables the sludge to be collected effectively.
- For example, in the case where the boundary wall is provided at the location on the downstream side of the bend of the coolant of the discharged coolant that is bent once or a plurality of times in the horizontal direction in the first reservoir, the sludge collection pump may be placed at a location that has a shorter distance to the boundary wall than a distance to the bend of the flow, i.e., at a location nearer to the bend of the flow than the boundary wall.
- In the coolant processing apparatus of the above aspect, the boundary wall is provided on the downstream side of the location where the flow of the coolant is bent to decrease the flow velocity. In this state, the location nearer to the bend of the flow than the boundary wall has the higher flow velocity of the coolant and is thus suitable to place the sludge collection pump. From this standpoint, in the coolant processing apparatus of the above aspect, the sludge collection pump is placed at a location nearer to the bend of the flow than the boundary wall, i.e., on a bend-of-the-flow side of a midpoint between the boundary wall and the bend of the flow. This configuration causes the sludge collection pump to be placed at a location having a relatively high flow velocity of the coolant in the first reservoir and enables the sludge to be effectively collected.
- According to one aspect, in the coolant processing apparatus provided with the sludge collection pump, the sludge collection pump may have an inlet port that is configured to suck the coolant upward. The coolant processing apparatus may further comprise an agitation plate provided at a location opposed to the inlet port on a bottom face of the first reservoir and configured to suppress stagnation of the flow of the coolant to the sludge collection pump.
- In the case where the sludge is sucked upward through the inlet port, a flow of the coolant from the periphery toward the inlet port is generated on a surface opposed to the inlet port. A point corresponding to the center of the inlet port is, however, likely to cause stagnation of the flow. In the coolant processing apparatus of this aspect, the agitation plate is provided at this point so suppress stagnation of the flow. This configuration suppresses precipitation and accumulation of the sludge and enables the sludge to be effectively collected.
- The agitation plate may be in any of various shapes. For example, when the inlet port has a circular shape, the agitation plate may be an axisymmetric solid having a sectional area monotonically decreasing from a bottom face toward a top.
- Examples of such solid include a cone and a paraboloidal surface. The diameter, the height and the like of such solid may be determined arbitrarily.
- According to one aspect, the coolant processing apparatus provided with the sludge collection pump may further comprise a separator configured to separate the sludge from the coolant collected by the sludge collection pump.
- The configuration of this aspect enables the coolant after separation of the sludge to be recycled and reused. Any of various devices may be used for the separator. For example, a cyclone device may be used for the separator.
- According to one aspect, the coolant processing apparatus provided with the separator may further comprise an injection port configured to inject the coolant after separation of the sludge by the separator, to a portion where the flow of the coolant has a lower flow velocity than a flow velocity of the coolant in a peripheral portion thereof.
- The configuration of this aspect forms the flow of the coolant in the tank by injection of the coolant and thereby assists circulation of the coolant.
- In the coolant processing apparatus of the above aspect, the injection port may be provided in the second reservoir.
- The coolant after removal of the sludge is retained in the second reservoir. There is, however, a possibility that a tiny amount of fine sludge that does not cause a substantial trouble in processing or machine working is left in the coolant. Such sludge may precipitate and be accumulated in a portion having a low flow velocity of the coolant in the second reservoir. This configuration enables the coolant to be injected to this portion and thereby prevents accumulation of the sludge. The coolant after separation of the sludge is reused for this purpose. This cuts the waste.
- According to one aspect, the coolant processing apparatus of the above aspect may further comprise a coolant feeding-in pump provided in the second reservoir and configured to collect the coolant.
- The configuration of this aspect enables the coolant after removal of the sludge to be reused for processing or machine working. The position and the number of the coolant feeding-in pumps may be set arbitrarily.
- Any of the aspects of the present disclosure may not necessarily include all the features described above. Part of these features may be appropriately omitted or may be appropriately adopted in combination.
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Fig. 1 is explanatory views schematically illustrating the general configuration of a prior art coolant processing apparatus; -
Fig. 2 is an explanatory view schematically illustrating the planar configuration of a coolant processing apparatus according to an embodiment; -
Fig. 3 is an explanatory view schematically illustrating the general configuration of a sludge collection pump; -
Fig. 4 is explanatory views schematically illustrating the general configuration of another prior art coolant processing apparatus; -
Fig. 5 is an explanatory view schematically illustrating the planar configuration of a coolant processing apparatus according to a modification; -
Fig. 6 is explanatory views schematically illustrating the general configuration of another prior art coolant processing apparatus; and -
Fig. 7 is an explanatory view schematically illustrating the planar configuration of a coolant processing apparatus according to a modification. -
Fig. 1 is explanatory views illustrating the general configuration of a prior artcoolant processing apparatus 1.Fig. 1A illustrates the outline of a planar configuration, andFig. 1B illustrates the outline of an X1-X1 sectional configuration. - A coolant used in a machine tool is flowed along with chips and sludge into the
coolant processing apparatus 1 as shown by an arrow A1 inFig. 1A . - A filter and a
chip conveyor 2 configured to discharge the chips are provided inside of thecoolant processing apparatus 1. The coolant after removal of the chips and relatively large sludge by means of the filter is flowed out to atank 3 as shown by an arrow A2. - As shown in
Fig. 1A , inside of thecoolant processing apparatus 1 is roughly divided into two areas DL and CL. The area DL is an area where the coolant prior to the removal of the chips and the like by means of the filter is kept and retained and is called a dirty layer. The area CL is an area where the coolant after the removal of the chips and the like by means of the filter is kept and retained and is called a clean layer. - As shown in
Fig. 1A , a plurality ofpumps 4 are provided in the clean layer and serve to circulate and return the coolant to the machine tool. - Part of the sludge included in the coolant is, however, fine sludge that is not removable by the filter. The coolant including such fine sludge is retained in the clean layer CL. Circulation of the coolant including the fine sludge to the machine tool is likely to cause troubles or problems, such as reduction of the processing quality and acceleration of the wear of the tool. The accumulation of the sludge in the clean layer CL requires cleaning of the entire area corresponding to the clean layer CL. Such cleaning imposes an extremely heavy load. A coolant processing apparatus according to an embodiment of the present disclosure described below aims to solve these problems.
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Fig. 2 is an explanatory view illustrating the general configuration of acoolant processing apparatus 10 according to one embodiment. The general configuration of thecoolant processing apparatus 10 according to the embodiment is similar to that of the prior art coolant processing apparatus 1 (shown inFig. 1 ). One advantage of the configuration of this embodiment is to provide thecoolant processing apparatus 10 of the embodiment by taking advantage of the configuration of the prior artcoolant processing apparatus 1 with some modification of the internal structure thereof. - As in the case of the prior art configuration, a coolant used in a machine tool is flowed along with chips and sludge into the
coolant processing apparatus 10 as shown by an arrow A1. While the chips are discharged by achip conveyor 12, the coolant after removal of the chips and relatively large sludge by means of a filter is flowed out to atank 20 as shown by an arrow A2. Inside of thecoolant processing apparatus 10 is divided into a dirty layer DL and a clean layer CL, like the prior art configuration (shown inFig. 1 ). In thetank 20 illustrated inFig. 2 , a hatched part indicates the dirty layer DL, and a remaining part indicates the clean layer CL. - Inside of the clean layer CL is separated into two areas called a first reservoir and a second reservoir by
partition plates boundary wall 23. Thepartition plate 25 has aninlet port 26 that is formed to allow the coolant to flow into from the dirty layer DL. - The clean layer CL is divided into a plurality of areas by these
partition plates boundary wall 23. Anarea 20a is a portion defined by thepartition plates area 20b is a portion defined by thepartition walls boundary wall 23 to keep and retain the coolant therein. Theareas - As illustrated, the coolant flowing out from the
inlet port 26 as shown by the arrow A2 flows as shown by an arrow F. After the flow of the coolant is bent at a bend or flexure F1, the coolant is retained in the first reservoir defined by thepartition plates boundary wall 23. Retaining the coolant causes fine sludge included in the coolant to stay in the first reservoir. More specifically, part of the sludge precipitates in the first reservoir, whereas the remaining sludge floats and drifts in the coolant and gradually sinks down. A supernatant portion is accordingly the coolant that contains almost no sludge. - The
boundary wall 23 is lower than thepartition plates partition plates boundary wall 23 is called the second reservoir. - As described above, in the
coolant processing apparatus 10 of the embodiment, the sludge stays in the first reservoir. In the case of cleaning the inside of the tank, a cleaning procedure accordingly requires detachment of a cover corresponding to only the first reservoir and does not require detachment of a cover corresponding to the entire clean layer CL for cleaning. This configuration thus advantageously reduces the cleaning load. - In the first reservoir, the
boundary wall 23 is provided ahead of the bend or flexure F1 where the flow of the coolant from thearea 20a to thearea 20b is bent. In other words, theboundary wall 23 is provided at a location where the flow velocity of the coolant flowing from thearea 20a is lowered. This configuration prevents the sludge staying in the coolant retained in the first reservoir from rolling up and riding over theboundary wall 23 to flow out. - Changing the height of the
boundary wall 23 changes the flow and the flow velocity of the coolant in the first reservoir and changes the behavior of the sludge in the first reservoir. Accordingly, the height of theboundary wall 23 may be determined by analysis or by experiment by taking into account the flow velocity of the coolant and the size of the sludge, with a view to allowing only the supernatant to flow out. The height of theboundary wall 23 may be adjusted to cause the sludge to be accumulated in a predetermined area S in the first reservoir. - The shapes, the configurations and the like of the
partition plates boundary wall 23, may be adjusted in order to control the behaviors of the sludge as intended, for example, in order to cause the sludge to stay in the first reservoir and to be accumulated in the predetermined area S. - A
sludge collection pump 30 is provided inside of the first reservoir to collect the staying sludge. The position of thesludge collection pump 30 may be determined arbitrarily but is provided in the area S where the sludge is accumulated, in the first reservoir according to the embodiment. In the illustrated example, the area S is present at a location in the vicinity of theboundary wall 23, so that thesludge collection pump 30 is provided at this location. In the case where the area S where the sludge is accumulated is present at a location farther from theboundary wall 23, the position of thesludge collection pump 30 is accordingly farther from theboundary wall 23. - In terms of preventing the sludge from riding over the
boundary wall 23 to flow out, however, it is preferable that the area S where the sludge is accumulated is present at a location farther from theboundary wall 23. - With a view to effectively collecting the sludge by using the
sludge collection pump 30, thesludge collection pump 30 may be provided at a location where the flow velocity of the coolant is kept at a certain level that does not cause the sludge to fully precipitate. This location may be determined, for example, by experiment or by analysis. For example, thesludge collection pump 30 may be provided at a location near to the bend or flexure F1 of the flow of the coolant (shown inFig. 2 ). - An
area 20c is an area defined by theboundary wall 23 and an outer wall of thetank 20. Anarea 20d is an area defined by thepartition plate 22 and the outer wall of thetank 20. Anarea 20e is an area defined by thepartition plate 21 and the outer wall of thetank 20. Theseareas -
Injection ports areas sludge collection pump 30 and removal of the sludge by a cyclone device described later is circulated to theseareas - The positions of the
injection ports injection ports - The coolant after removal of the sludge is retained in the second reservoir. There is, however, a possibility that a tiny amount of fine sludge that does not cause a substantial trouble in processing or machine working is left in the coolant. Providing the
injection ports - A plurality of coolant feeding-in
pumps 50 are provided in thearea 20e of the second reservoir. The coolant after sufficient removal of the sludge in the first reservoir is collected by the coolant feeding-inpumps 50 to be recycled to and reused in the machine tool. The number and the locations of the coolant feeding-inpumps 50 may be determined arbitrarily. The configuration of the embodiment that provides the first reservoir and the second reservoir in the tank of the coolant to allow for removal of the fine sludge prevents troubles caused by the inflow of the coolant including the sludge into the machine tool. -
Fig. 3 is an explanatory view schematically illustrating the general configuration of thesludge collection pump 30. The right side of the drawing shows the state in the vicinity of aninlet port 31 of thesludge collection pump 30 placed in thearea 20b. Theinlet port 31 of thesludge collection pump 30 is formed in a cylindrical shape and is attached to suck the coolant vertically upward relative to a bottom face of thetank 20. - An
agitation plate 32 is provided at a position opposed to theinlet port 31 on the bottom face of thetank 20. Theagitation plate 32 may be formed in a cone-like shape as illustrated. The shape of theagitation plate 32 is, however, not limited to the illustrated example but may be any of various shapes having a gradually decreasing sectional area in a circular cross section. Aprojection 33 in a columnar shape may be added to the top of theagitation plate 32 as illustrated. - The flow of the coolant is likely to stagnate at a location corresponding to a central axis of the
inlet port 31. Providing theagitation plate 32 as illustrated prevents stagnation of the flow of the coolant in the vicinity of the center of theinlet port 31 or prevents the flow velocity of the coolant from being lowered in the vicinity of the center of theinlet port 31 and thereby enables the sludge to be effectively collected. - As described above, according to the embodiment, the
boundary wall 23 has a height H2 that is lower than a height H1 of thepartition wall 22. This configuration allows only the supernatant of the coolant to flow out of theboundary wall 23 as shown by arrows b. Providing theboundary wall 23 in such settings lowers the flow velocity of the coolant and causes the sludge included in the coolant to sink down as shown by arrows a and to be accumulated in a predetermined area. According to this embodiment, the coolant with the accumulated sludge is collected by thesludge collection pump 30. - In the drawing, the height H2 looks like almost half the height H1. This is, however, only illustrative and does not intend to limit the height of the
boundary wall 23 to this height range. - The coolant collected by the
sludge collection pump 30 is flowed into acyclone device 40 that is configured to separate the sludge from the coolant by taking advantage of the centrifugal force. The separated sludge is discharged from thecyclone device 40 by opening a drain valve (not shown). - The coolant after removal of the sludge is injected through the
injection ports 41 and 42 (shown inFig. 2 ) into thetank 20. - The
cyclone device 40 is used for separation of the sludge according to the embodiment, but another mechanism may be employed for separation of the sludge. In the case where there is no need to recycle and reuse the coolant after separation of the sludge, thecyclone device 40 may be omitted, and the coolant with the accumulated sludge may be discarded. -
Fig. 4 is explanatory views illustrating the general configuration of another prior artcoolant processing apparatus 1A. Thecoolant processing apparatus 1A ofFig. 4 has a different configuration from that of thecoolant processing apparatus 1 ofFig. 1 .Fig. 4A illustrates the outline of a planar configuration, andFig. 4B illustrates the outline of an X2-X2 sectional configuration. - In the
coolant processing apparatus 1A, achip conveyor 2A is placed at the approximate center in planar view as shown inFig. 4A . A coolant is flowed into thecoolant processing apparatus 1A as shown by an arrow A1 and flows out from both sides of thechip conveyor 2A into atank 3 as shown by arrows A2. Chips and relatively large sludge are removed by filters from the respective flows of the coolant, like thecoolant processing apparatus 1 shown inFig. 1 . - Accordingly, an area prior to the outflow of the coolant as shown in the arrows A2 is a dirty layer DL, and an area after the outflow is a clean layer CL. A plurality of
pumps 4A for collection of sludge are provided in the clean layer CL. -
Fig. 5 is an explanatory view schematically illustrating the planar configuration of acoolant processing apparatus 10A according to a modification. - The
coolant processing apparatus 10A of the modification is implemented by modifying the internal structure of thecoolant processing apparatus 1A shown inFig. 4 . - A partition plate 21A is placed such as to form only one
inlet port 26A which the coolant is flowed through from a dirty layer DL into a clean layer CL. As a result, the coolant flows through the oneinlet port 26A into the clean layer CL as shown by an arrow A2. Discharge of chips and relatively large sludge by achip conveyor 12A and removal of the chips and the relatively large sludge by a filter are similar to those described above in the embodiment. - In the clean layer CL, a first reservoir is formed by
partition plates boundary wall 23A. The coolant in the first reservoir flows as shown by an arrow FA to be bent at a bend or flexure FA1 and subsequently flow toward theboundary wall 23A with decreasing the flow velocity. - Like the embodiment described above, adjustment of the height of the
boundary wall 23A causes the sludge to stay in the first reservoir and enables only the supernatant to flow out to the downstream of theboundary wall 23A, i.e., to a second reservoir. Adjusting the height of theboundary wall 23A and the shape, the configuration and the like of thepartition wall 24A enables the sludge to be accumulated in a predetermined area in the first reservoir. - A
sludge collection pump 30A is provided in the first reservoir. As in the embodiment described above, the sludge collection pump 30A is placed at a location where sludge is accumulated in the first reservoir. The coolant collected by the sludge collection pump 30A is subjected to separation of the sludge by means of a cyclone device and is then returned into atank 20A throughinjection ports - In the configuration of the embodiment, the
injection ports Fig. 2 ). As in the configuration of this modification, however, theinjection port 41A may be provided in the first reservoir, and theinjection port 42A may be provided in the second reservoir. This configuration enables theinjection ports 41A to be used to control the flow of the coolant in the first reservoir. The arrangement of the injection ports is, however, not limited to the illustrated example. Both the injection ports may be provided in the first reservoir or may be provided in the second reservoir. -
Pumps 50A for collection of the coolant are placed in the second reservoir. The coolant collected by thesepumps 50A is circulated to the machine tool. -
Fig. 6 is explanatory views illustrating the general configuration of another prior artcoolant processing apparatus 1B.Fig. 6A illustrates the outline of a planar configuration, andFig. 6B illustrates the outline of an X3-X3 sectional configuration. - In the
coolant processing apparatus 1B, achip conveyor 2B is placed at the approximate center in planar view and on an upper side of atank 3B as shown inFig. 6A . A coolant is flowed into thecoolant processing apparatus 1B as shown by an arrow A1, flows below thechip conveyor 2B, and flows out from both sides of thechip conveyor 2B into thetank 3B as shown by arrows A2. Chips and relatively large sludge are removed by filters from the respective flows of the coolant, like thecoolant processing apparatus 1 shown inFig. 1 . - Accordingly, an area prior to the outflow of the coolant as shown in the arrows A2 is a dirty layer DL, and an area after the outflow is a clean layer CL. A plurality of
pumps 4B for collection of sludge are provided in the clean layer CL. -
Fig. 7 is an explanatory view schematically illustrating the planar configuration of acoolant processing apparatus 10B according to a modification. - The
coolant processing apparatus 10B of the modification is implemented by modifying the internal structure of thecoolant processing apparatus 1B shown inFig. 6 . - A
partition plate 21B is placed such as to form only oneinlet port 26B which the coolant is flowed through from a dirty layer DL into a clean layer CL. As a result, the coolant flows through the oneinlet port 26B into the clean layer CL as shown by an arrow A2. Discharge of chips and relatively large sludge by achip conveyor 12B and removal of the chips and the relatively large sludge by a filter are similar to those described above in the embodiment. - In the clean layer CL, a first reservoir is formed by
partition plates boundary wall 23B. The coolant in the first reservoir flows as shown by an arrow FB to be bent at a bend or flexure FB1 and subsequently flow toward theboundary wall 23B with decreasing the flow velocity. - Like the embodiment described above, adjustment of the height of the
boundary wall 23B causes the sludge to stay in the first reservoir and enables only the supernatant to flow out to the downstream of theboundary wall 23B, i.e., to a second reservoir. Adjusting the height of theboundary wall 23B and the shape, the configuration and the like of thepartition wall 24B enables the sludge to be accumulated in a predetermined area in the first reservoir. - A
sludge collection pump 30B is provided in the first reservoir. As in the embodiment described above, thesludge collection pump 30B is placed at a location where sludge is accumulated in the first reservoir. The coolant collected by thesludge collection pump 30B is subjected to separation of the sludge by means of a cyclone device and is then returned into atank 20B throughinjection ports - In the configuration of the embodiment, the
injection ports Fig. 2 ). As in the configuration of this modification, however, theinjection port 41B may be provided in the first reservoir, and theinjection port 42B may be provided in the second reservoir. This configuration enables theinjection ports 41B to be used to control the flow of the coolant in the first reservoir. The arrangement of the injection ports is, however, not limited to the illustrated example. Both the injection ports may be provided in the first reservoir or may be provided in the second reservoir. -
Pumps 50B for collection of the coolant are placed in the second reservoir. The coolant collected by thesepumps 50B is circulated to the machine tool. - The coolant processing apparatus according to any of the embodiment and the modifications described above causes the fine sludge included in the clean layer to stay in the first reservoir and thereby effectively removes the sludge. Another advantage is to achieve such effects by the simple configuration of dividing the inside of the tank into the first reservoir and the second reservoir, with taking advantage of the prior art tank structure for the coolant.
- All the various features described in the above embodiment and modifications are not essential, but part of these features may be appropriately omitted or may be appropriately used in combination. The present disclosure is not limited to the embodiment or the modifications described above but may be implemented by various other modifications.
- For example, the position of the
boundary wall boundary wall partition plate 22 as shown inFig. 3 . This configuration may, however, be determined arbitrarily. The boundary wall may have a configuration including a lower center portion and higher end portions or may have a configuration of changing the height in an arc shape. The boundary wall may not be necessarily a flat plate but may be formed in another shape or configuration, for example, to have a curved surface including a center portion protruded toward the first reservoir side or toward the second reservoir side or to have a bent surface. - Furthermore, the
boundary wall 23 may not be placed perpendicular to the bottom face but may be placed obliquely, for example, to be inclined to the first reservoir side or to be inclined to the second reservoir side. - A variety of designs and settings are available for the dimensions and the shape or the configuration of the first reservoir. It is preferable that the first reservoir has such a capacity that allows a coolant to be retained with sufficiently decreasing the flow velocity of the coolant by taking into account the inflow of the coolant per time into the first reservoir.
- The present disclosure is applicable to remove sludge from a coolant that is discharged from a machine tool and that includes the sludge.
-
- 1, 1A, 1B
- coolant processing apparatus
- 2, 2A, 2B
- chip conveyor
- 3, 3A, 3B
- tank
- 4, 4A, 4B
- pump
- 10, 10A, 10B
- coolant processing apparatus
- 12, 12A, 12B
- chip conveyor
- 20, 20A, 20B
- tank
- 21, 21A, 21B
- partition plate
- 22, 22A, 22B
- partition plate
- 23, 23A, 23B
- boundary wall
- 24, 24A, 24B
- partition plate
- 25
- partition plate
- 26, 26A, 26B
- inlet port
- 30, 30A, 30B
- sludge collection pump
- 31
- inlet port
- 32
- agitation plate
- 33
- projection
- 41, 41A, 41B
- injection port
- 42, 42A, 42B
- injection port
- 50, 50A, 50B
- coolant feeding-in pumps
Claims (10)
- A coolant processing apparatus configured to remove sludge from a coolant that is discharged from a machine tool and that includes the sludge after removal of chips by means of a filter, the coolant processing apparatus comprising:a first reservoir provided inside of a tank for the coolant and configured to retain the coolant therein such as to cause the sludge to stay; anda second reservoir provided adjacent to the first reservoir and configured to retain therein the coolant flowing out from the first reservoir, whereinthe first reservoir includes a flow path which the discharged coolant flows in; and a portion provided on a downstream side of the flow path to retain the coolant therein, andthe flow path is configured to bend a flow of the discharged coolant once or a plurality of times in a horizontal direction,the coolant processing apparatus further comprising:a boundary wall provided to configure a boundary between the first reservoir and the second reservoir, whereinthe boundary wall is placed at a location on a downstream side of a bend of the flow path, andthe boundary wall has a height that allows a supernatant of the coolant retained in the first reservoir to flow out to the second reservoir.
- The coolant processing apparatus according to claim 1,
wherein the boundary wall has a height that decreases a flow velocity of the coolant in the first reservoir at least partly to a level that causes the sludge to be accumulated. - The coolant processing apparatus according to claim 2,
wherein the first reservoir has a shape or a structure that causes the sludge to be accumulated in a specific area. - The coolant processing apparatus according to claim 1, further comprising:
a sludge collection pump placed on an upstream side of the boundary wall in the first reservoir to collect the sludge precipitating in the first reservoir. - The coolant processing apparatus according to claim 4,wherein the first reservoir has a shape or a structure that causes the sludge to be accumulated in a specific area, andthe sludge collection pump is provided in the specific area in the first reservoir.
- The coolant processing apparatus according to claim 4,wherein the sludge collection pump has an inlet port that is configured to suck the coolant upward,the coolant processing apparatus further comprising:
an agitation plate provided at a location opposed to the inlet port on a bottom face of the first reservoir and configured to suppress stagnation of the flow of the coolant to the sludge collection pump. - The coolant processing apparatus according to claim 6,wherein the inlet port has a circular shape, andthe agitation plate is an axisymmetric solid having a sectional area monotonically decreasing from a bottom face toward a top.
- The coolant processing apparatus according to claim 4, further comprising:
a separator configured to separate the sludge from the coolant collected by the sludge collection pump. - The coolant processing apparatus according to claim 8, further comprising:
an injection port configured to inject the coolant after separation of the sludge by the separator, to a portion where the flow of the coolant has a lower flow velocity than a flow velocity of the coolant in a peripheral portion thereof. - The coolant processing apparatus according to claim 1, further comprising:
a coolant feeding-in pump provided in the second reservoir and configured to collect the coolant.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2022146904A JP7233145B1 (en) | 2022-09-15 | 2022-09-15 | Coolant processor |
Publications (1)
Publication Number | Publication Date |
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EP4338886A1 true EP4338886A1 (en) | 2024-03-20 |
Family
ID=85414466
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP23192165.1A Pending EP4338886A1 (en) | 2022-09-15 | 2023-08-18 | Coolant processing apparatus |
Country Status (6)
Country | Link |
---|---|
US (1) | US11951580B1 (en) |
EP (1) | EP4338886A1 (en) |
JP (1) | JP7233145B1 (en) |
KR (1) | KR20240037837A (en) |
CN (1) | CN117140170B (en) |
CA (1) | CA3212441A1 (en) |
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- 2023-08-18 EP EP23192165.1A patent/EP4338886A1/en active Pending
- 2023-09-07 CN CN202311149827.4A patent/CN117140170B/en active Active
- 2023-09-11 US US18/465,035 patent/US11951580B1/en active Active
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Also Published As
Publication number | Publication date |
---|---|
JP2024042297A (en) | 2024-03-28 |
US11951580B1 (en) | 2024-04-09 |
CA3212441A1 (en) | 2023-11-14 |
KR20240037837A (en) | 2024-03-22 |
CN117140170A (en) | 2023-12-01 |
JP7233145B1 (en) | 2023-03-06 |
CN117140170B (en) | 2024-02-23 |
US20240091895A1 (en) | 2024-03-21 |
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